Percolator



Patented Apr, 25,, E933 JCSEPH F. LAMB, GF'HEW Em'm'm, eonm'zwmuw, ASSIGNOR m :mmmi m, E 6a: cmma, my HEW 331mm, couxmcmcww, A maronmsxou w wzmzwzcmww PEEQQIEZJEEQR mm May 566,

unit 0% the is A typical present uensiLguch as eiectric cmfec pcrcciaicr c'minamly includes 5% 006.3 membe? a bass misc?? there being; a, heating unit cmrrle by the base member which is contained in a recess 81c? fincai by the 0f the 1 06 memben i a m ampmt abject in. gel-comma in which cvssed by double Wa" W11? (:5 ma engaging wail-HS 0f bcdy 2am? ha which double Wall icfines the a'cccss. This the heating crmafli. he s ccnductc Enarfly '40 the consmcmnic evicc and to Ody anca mdle of the b0015 damage 50 the connecbm s pcrcolaizoln he inventicof heath-Q" 2 017 he hep.

the cascc double Wane 3'" i313: @xpzmsicn thcr refluces to a "mes (She use 313 s1n.a 1er cxpanslcn ciore been wrich {ha went in c l erm! No. SAWS insulator, and 2a WEE}? umhsimbfic can diiticn exists. It; is this ccmdiifzim which inc 3121614362 m be obviu by 126mm; in venfzion which pmvicics the 10 9% wailicl sizwctureo Should all Ywfi mxia 1921c peycchtcr and fi'w qacvics bcccmc awczfi heated. before the fusc him s @hc cremicn. file space is prevencd, 01? maimed the double walled 0161s the unit or che objects Wm $9 cbvicum pumzcd out invcntiono 1s broken 9m H more dearly bring an:

I s a scwew'im Wmg developmg strucfama fine case and boa WA? c4 new Referring ILQW m of a percolator is 1" tbs reference chamu is designated 13. Th contained in the base deez'cncc character (1 The base B may Wiph any suivabie type oi suppcrtmg hc fee; shown at The base has a cur've wall 11 which is e: aim cxpcsed surface 01 the percclmm WhGE the pairing am assembie, and this Serm mf'sc in 530p W111 112, Upstanding" fromtiac riphery of the top wall 12 is a cylindrical wall 13 that is connected to an upraised wall 14, having a central opening 15, by a curved or conically shaped ortion 16. It is the walls 13, 14, and 16 t at actually define the recess in which the heating unit C is housed. These walls provide what is, in effect, a central upraised boss that is fitted in a recess in the body member as hereinafter described.

The body A is formed with a lower wall structure, which is substantially complemental to the COIIQS )onding structure of the base B described in t 1e preceding aragraph. The body A includes an outer we 1 17 which cooperates with the wall 11 of the base B to define the exposed contour of the percolator, and this wall '17 terminates in a bottom wall 18 which engages with the top wall 12 when the base B and body A are assembled. A cylindrical wall 19, which tinds its counterpart in the wall 13 of the base B, projects upwardly from the wall 18, and is connected to an upraised portion 20 by a conically shaped portion 21. The upraised portion 20 is formed with an opening 22 which aligns with the opening 15 to provide the opening through which the clamp for the heating unit extends. The central upraised boss on the base B is received in the recess in the body A so that when the parts are assembled, the walls 12, 13, 16, and 14; of the base B closely engage the corresponding walls 18, 19, 21, and 20 of the body A to provide a double walled recess which is referred to generally by the reference character D, and which constitutes a housing for the heating unit C. This heating unit is of the same general type as that shown in the Lamb Patent Number 1,060,263 dated April 29, 1913. The latter is posi tioned in the recess B by a structure including the threaded stem 23 extending through the openings 15 and 22, and a nut 24 which is screwed on the stem 23 and which clamps against the flat wall 20 to cooperate with a flange 25 in positively positioning the heating unit. The stem 23 constitutes a portion of the top radiating member, as in said Lamb Patent No. 1,060,263. The heating unit has a bottom radiating plate 29 provided with a cylindrical peripheral and upstanding flange 30 which snugly fits in the recess D, as shown in Fig. 1. \Vithin the radiating plate or member 29 is located the electrical heating element 31 which consists of a number of superimposed sections with insulating sheets 32 therebetween. This permits .of a unit of relatively small diameter, and therefore one having a lesser amount of expansion when heated.

By preference, the heating unit is provided with a protective device for breaking the current in the event the utensil reaches a dangerous degree of heat, as when the current is left on after the utensil becomes empty, or substantially empty. This protective device may be of any suitable sort,

but, by way of example, I have shown a protective device in accordance with the disclosure of the patent to Curtiss No. 1,507,587 granted September 9th, 1924. The construction and operation of this protective device need not be described here, as they are completely disclosed in said Curtiss patent.

The foregoing construction is readily manufactured, and the base and body are easily assembled with the heating unit to provide the finished product. In assemblin parts, the circumferential, or cylindricafi walls 13 and 19 are preferably drawn and sized together so that there is a very close intimate contact therebetween, and then the unit is tightly fitted into the recess D so that there is a close intimate contact between the flange 30 and the wall 13; all of which means that the radiating plate, the wall 13, and the wall 19 are in direct conductive relation. In the operation of the device, should all of the water inadvertently boil out, the fuse of the protective device would blow, but the condition may be such that before the fuse blows, the utensil may become overheated. In this event, the extent of overheating of the body is materially reduced, due to the fact that the base B is in direct heat conductivity with the heating unit, and is effective to have heat conducted thereto from the heating unit and which heat is dissipated by radiation from the base. The use of a comparatively small sized heating unit C provides less inherent expansion upon abnormal heating, and this feature, together with the double wall housing which holds the unit against expansion, reduces to a minimum the liability of the creation of a detrimental space between the unit C and the double wall housing which would be detrimental to the'ciiicient operation of the percolator.

As many changes could be made in the above construction and many apparently Widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

\Vhat is claimed is:

1. In an electrically heated cooking nten sil of the character described, and in combination, a body member and a base member,

said base member having a top wall and a cfiylindrical boss upstanding therefrom and de ning a heating unit recess interiorly of the base member, said body member having a boss complemental to said first boss the boss of the base member being snugly fitted in the boss of the body. member whereby the cylindrical walls of the bosses are in close and constant intimate contacting engagement, and a heating unit having a top radiating member, said heating unit also having a bottom radiating member with a cylindrical flange snugly fitted in and in intimate contacting relation with the cylindrical wall of the boss on the base member, said heatingunit also having a heat-- ing element interposed between and electrically insulated from said radiating members.

2. In an electrically heated cooking utensil of the character described, and in combination, a body member and a base member, said base member having a top wall and a boss upstanding therefrom, said boss'having a cylindrical wall and a top wall, said body member having a bottom wallformed with a recess having a cylindrical wall and a top Wall, said boss being snugly fitted in said recess whereby the cylindrical walls of the boss and the recess are in close intimate contacting engagement, a heating unit nested in the recess defined by the boss in the base member and having a top radiating member provided with a stem extending through openings in the top walls of said recess and boss, said stem having a flange engaging the underside of the top wall of said boss, said heating unit also having a bottom radiating place provided with a cylindrical flange snugly fitting in and having close intimate contacting engagement with the cylindrical wall of the boss, said unit also having a heating element interposed between said radiating members, and a nut threaded on said stem and between which and said flange the top walls of the recess and boss are securel clamped.

3. In an electrically heated cooking utensil of the character described, and in combination, a body member and a base member, said members each having a complemental boss the corresponding walls of which are permanently maintained in intimate heat conducting engagement, a heating unit housed within the boss on the base member, and a heat radiating member carried by the heating unit and having a flange maintained in intimate heat conducting engagement with one of the walls of the boss on the base member.

JOSEPH F. LAMB. 

